How far do you generally need to drive? I see on the Ford site that the range for the Focus Electric is about 76 miles per charge. That's going to be best-case scenario. In the winter, you can cut that by 1/3 to 1/2 if you live in a cold climate.
I have a Ford C-Max Energi, which is a plug-in hybrid. The electric range for my car is published as 21 miles. In the summer, I get about 25, and in the winter, I get about 14 miles range, after which, the car becomes a hybrid with unlimited "range."
One piece of advice I have for anyone shopping for a newer Ford: take a good look and spend some time playing with the "infotainment" system to see if you like it. Compare it to other brands. I never really paid much attention to that sort of thing before I got this car, and while I love the car overall, I think the Sync system sucks. It's not all that creative or intuitive, and the stinking mapping/GPS function is such a pain in the a$$ that I usually just say screw it and use my phone's navigation app instead.